I don't know if it is just me but I seem to notice that the AI tends to trade tech knowledge amongst itself quite a lot, insane amounts in fact... to the point where they can out tech you with barely having any tech buildings. This phenomenon is probably directly correlated to how many AI players are in the game, because more trading of points can occur.
I generally like to play in games with many AI players, typically 12-20 AI players. It seems to me like the AI likes to trade tech amongst itself quite a bit, this isn't a problem in itself, but at the rate that it is occurring right now I feel that this is an issue that has to be addressed because it kills the pacing of the game. I set the technology pacing on epic, but even by turn 100 or so nearly every single one of the AI has maxed out all of the trees while I am barely though the first quarter of some of the trees. I even built two conclaves as starting towns and it is still not possilble to keep up with the pace of their teching, solely because of the way they trade tech points, probably at a one to one ratio which you will not get unless the AI asks you. I can tell they don't have a lot of research because when I do research treaties with them I can see that I am getting far more research than they are out of the treaties. Even the crummiest little nations with barely 2-3 cities in comparison to the about 15 I have, have maxed out their trees.
The way that the tech points are set up right now basically self perpetuates the game very quickly to the end game. The AI basically trades for enough tech points to learn a tech, then gains that tech and the some tech points, then trades those points away to gain more tech... and around and around without barely having any research.
There needs to be some kind of limit on this spontaneous intelligence generation. Maybe, the game should keep track of how much of a tech you actually researched yourself and award you tech points accordingly. Say if you researched a tech 50% of it yourself then you would only be awarded 50% of the tech points. That way the amount of tech points in circulation would be less, and this would help to curve the amount of tech generation, while also giving technology friendly nations a greater advantage.